Online hacktivist collective Anonymous has released a comprehensive list of websites suspected to be linked to Islamic State (Isis), together with the companies responsible for hosting the content. Many of the web hosting companies are UK, Europe and US-based, provoking criticism that they are complicit in disseminating Isis propaganda used to recruit members and incite terror attacks.

The latest release forms part of Op Isis (#OpISIS), an ongoing cyber campaign carried out by the amorphous group designed to disrupt Isis’ online operations and “cure the Isis Virus”. It was compiled by GhostSec, a prominent faction of Anonymous that has been monitoring Isis through its social media channels.

“These websites were collected by monitoring Islamic State accounts on Twitter and logging them over a period of three months,” an Anonymous member involved in compiling the list told IBTimes UK.

“We believe it is critical for the world to see who is hosting this type of content and we believe they should be held accountable. These web assets pose a great risk as they are a source of recruitment for Islamic State and a communications platform used to conduct atrocities against humankind.”

The list includes prominent companies like CloudFlare and Yahoo! Europe, responsible for providing server space for the domain name and protecting the sites from cyber threats like DDoS (distributed denial of service) attacks.

All websites listed below are frequently used by the Islamic State through Twitter and other social media platforms for transmission of propaganda, religion, recruitment, communications and intelligence gathering purposes. (Web host companies) are unaware of their customers content or they turn a blind eye for easy profit and choose to accept bloodmoney. CloudFlare is by far the largest offender on this list and they have been made aware of the specified content they are protecting… Together we can stop this from spreading and hold these companies accountable for their less than ethical business practices. – GhostSec statement

IBTimes UK has reached out to several of the UK and US-based firms, including CloudFlare, but no response to requests for comment have yet been given.

Many of the websites listed do not appear to have any affiliation with jihadist groups, however links can be found to extremists and supporters of Isis when traced back to related social media accounts.

As an example, the site dr-algzouli.com, hosted by Web Hosting UK, can be linked to a Twitter profile of the same name that expresses support for a caliphate under Islamic State rule.

Hundreds of websites allegedly associated with Isis have already been attacked by Anonymous and its affiliates.

Most recently Anonymous claims to have attacked 233 websites and “destroyed” 85 of them as part of OpIsis.

Lists of Twitter accounts related to Isis have also been released, however the methods employed by Isis members and its supporters have meant that having them reported and removed has so far proved ineffective.

A separate source within Anonymous previously told this publication that Twitter provides a Hydra-like platform for Isis to thrive.